One problem with helicopters is that even if you get it working mechanically, you have to actually fly it in a controlled manner. Having tried to fly a simulat

One problem with helicopters is that even if you get it working mechanically, you have to actually fly it in a controlled manner. Having tried to fly a simulated helicopter with no control system, my conclusion is that I would've died in seconds from flipping over while trying to move forward. So I have lot of respect for the people who worked out the math on that.